Abstract: A cathode ray tube display having reduced electric field emissions comprising a cathode ray tube 100, an element 200 for detecting modulations in the final anode voltage of the CRT, the signal not being directly dependent on the deflection driving means 115. A matching network 205 provides phase and gain correction to the signal from element 200, amplification means 210 receives the signal from network 205 and an emission means 215 radiates a cancelling electric field dependent on the modulations detected by said element 200.

Abstract: Synchronization apparatus comprising a phase-locked loop for generating an output signal and for synchronizing the output signal to an input signal, characterized in that the apparatus comprises a controller for iteratively determining whether the output signal is synchronized to the input signal by the phase-locked loop and adjusting the frequency of the output signal to bring the output signal within the capture range of the phase-locked loop if the output signal is not synchronized to the input signal.

Abstract: Deflection apparatus for a raster scanned cathode ray tube display comprises a flyback circuit (T2,T4,Ly,Df,Cf) including a switch (T2,T4) connected in series with an inductor (Ly). The switch (T4) is responsive to a line drive signal (LINE) to alternately open and close a current path through the inductor (Ly) between a first voltage level (B+) and a second voltage level (0V) lower than the first voltage level (B+) to generate a raster scan current signal in a deflection coil of the display. The amplitude of the raster scan signal is determined as a function of the first voltage level (B+) and the frequency of the line drive signal (LINE). A feedback circuit (D2,R3,D3,C2) connected to the switch (T4) generates a feedback signal (F) as a function of current flowing out of the switch (T4).